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2004
Furan derivatives
R 0060
Bi(OTf)3/[bmim]BF4 as Novel and Reusable Catalytic System for the Synthesis of
Pyrrole and Thiophene Derivatives. — Treatment of 1,4-diketones (I) with
44- 118 Furan,
catalytic Bi(OTf)3 in [bmim]BF4 as the reaction medium gives trisubstituted furans (II)
in good yields. The solvent containing the catalyst can be reused after extraction with
Et2O. Furthermore, addition of anilines or Lawesson reagent to the reaction mixture allows a high-yielding synthesis of pyrroles or thiophenes. — (YADAV*, J. S.; REDDY,
B. V. S.; EESHWARAIAH, B.; GUPTA, M. K.; Tetrahedron Lett. 45 (2004) 30,
5873-5876; Div. Org. Chem., Indian Inst. Chem. Technol., Hyderabad 500 007, India;
Eng.) — Mais
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